CZ2000112A3 - Atomizing tilting valve and process for producing thereof - Google Patents

Abstract

The spray tilting valve (10) has an integrated press fit a hollow stem spindle (18) and a pressed conical stem cup (19). The upper outer peripheral edge (20) of the stem cup (19) normally fully sealing against the gasket (21) surrounding it! stem spindle (18), except when valve (10) tilted. The outer lower end (18b) of the stem spindle (18) a the inner side of the stem cup (19) defining annular space (30). Under the Upper Outer Perimeter Edge (20) the stem cup (19) is at least one dispensing opening (31), formed during forming, passing through the stem stem wall (18) and into said annular space (30). It is in the stem spindle (18) at its lower end (18b) simultaneously forming an annular recess (34) and at least one dispensing opening (31). The finished stem spindle (18) is inserted into the mold cavity (36). Bottom (39) an annular shield (38) blocking the dispensing opening (31), and together with the mold cavity (36) and the lower end (18b) of the stem spindle (18) defines a shank cup shank (19). The stem cup (19) has an annular shape during forming a projection (35) extending into the annular recess (34) for creating a solid and fully integrated stem a cup (19) and a stem spindle (18) that work basically as one piece. The annular space (30) is also delimited by the lower portion (39) of the shield (38).

Description

Spray tilting valve and method of its manufacture

Technical field

The present invention relates to valves for dispensing products from pressurized containers, in particular spray tilting valves, which are actuated by finger pressure on a portion of the spindle shaft extending above the spray mounting cup, thereby angularly tilting the tip valve shaft.

BACKGROUND OF THE INVENTION

In the known spray tilt valve design, the hollow stem discharge spindle is mounted in a resiliently deformable gasket at the top of the container, the stem spindle extending through the gasket so that it extends both inside and out of the container. The portion of the stem discharge spindle extending outwardly from the cartridge is provided with an axial or radial outlet, and the portion of the stem stem extending into the cartridge has at least one transverse inlet dispensing opening. When the valve is actuated by tilting, the product flows from the container to the transverse inlet, upwardly through the hollow stem spindle, and out through the axial or radial outlet.

In this known design, the tilting valve has a substantially conical stem cup provided with a sealing insert at the bottom, the outer peripheral edge of which is normally in full engagement with the bottom surface of the sealing insert inside the cartridge.

The cup and the sealing insert define an annular space surrounding the stem spindle, which space is connected to the stem spindle cavity by means of a lateral inlet dispensing opening. The stem cup, which is normally pressed by its outer circumferential edge onto the bottom surface of the gasket, prevents product from flowing out of the spray container into the aforementioned annular space and into the stem spindle inlet. When the finger is pressed against the stem spindle extending above the mounting cup, the outer peripheral edge of the stem cup is partially spaced from the surface of the gasket. The product then flows (with the aid of propellant) between the spaced outer peripheral edge of the cup and the seal into the annular space, then through the inlet and upward dispensing orifice, and is dispensed through the dispensing orifice of the stem. After releasing the finger pressure from the stem spindle, the outer peripheral edge of the stem cup rests fully on the sealing insert again. The annular space and the inlet opening are then separated from the product in the container. In this known construction, a spring is used to bias the stem cup, in particular its outer peripheral edge, against the sealing insert.

One problem with the known construction described above is that it is very difficult to create a transverse inlet dispensing opening when the stem spindle is one piece. In order to be effective, the opening must lie entirely within the annular space surrounding the stem spindle and delimited by the gasket and the stem cup. In other words, the dispensing opening must be below the sealing insert and below the top of the stem spindle. To form the inlet opening in a conventional manner, a special tool needs to be introduced down through the shaft spindle cavity to pierce the dispensing opening from the interior of the spindle; a special tool can also be introduced through the bottom of the spindle during forming, creating a dispensing opening and then blinding the bottom. Due to the limited space between the cup wall and the stem spindle, the drill may alternatively be drawn at an angle above the outer edge of the stem cup to drill a downwardly inclined inlet opening into the stem spindle. Not all of these operations to create a dispensing opening are satisfactory due to the complexity and / or controllability of the dispensing opening.

Thus, it is desirable that in the tilting valve assemblies of the general construction described above, the stem spindle and the stem cup are transversely and vertically stable and the controllability of the tilting valve is fixed to each other. The spindle and the cup may be made in one piece, but in such a case the above problems occur in connection with the formation of the inlet dispensing opening. If the spindle and the stem are made of two separate pieces, then joined together, it is necessary to prevent the two parts from being aligned very carefully with respect to each other and to prevent them from detaching during operation, so as to prevent a larger movement of one the other when the tilting valve is in operation.

In practice, however, this is difficult to achieve. When the stem spindle and the stem cup are separately pressed from some suitable material, for example nylon, which is hygroscopic, and then assembled, the swelling of these assembled parts in the surrounding environment may cause the stem and stem cup joints to be dismantled. Should the two separate pieces not be carefully designed, the actuating of the assembled tilting valve may force the stem shaft out of its connection with the stem cup.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a tilting valve of the generally known design, which has at least one transverse inlet dispensing opening which can be easily manufactured and whose dimension can be carefully controlled. The stem spindle and stem cup are manufactured in a manner that results in the rigidly coupled stem spindle and stem cup functioning essentially as one piece in which the relative movement or disengagement of the valve is not possible. In the method according to the invention, in the first molding operation, a shaft spindle is first made of plastic, the hollow spindle having a closed base and having an annular groove on its outer side in the area of the base. At the same time, at least one precise transverse inlet dispensing opening passing through the side wall of the stem spindle is simply formed slightly above this annular recess. The plastic stem is then pressed around the stem spindle. Normally, it would appear that due to the dispensing opening in the annular space between the stem cup, the stem spindle and the gasket, it is difficult to do so. Apparently, the inlet dispensing opening may not be filled when forming the stem cup. This is due to the uniqueness of the way in which the desired design of the tilt valve is achieved, using a special shield shape located above the inlet opening. The shield surrounds the stem spindle and acts at the same time as part of the mold cavity in forming the stem cup and forming the above-mentioned annular space. When the stem cup is formed around the stem spindle, an annular projection is formed thereon which extends into the annular recess situated in the outer wall of the stem spindle. After removing the shield and removing the remainder of the stem cup cavity, it is • 9

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9999 · 99 999 99 99 as a result of a completely integrated and very rigid tilting valve with a stem cup and a stem spindle connected by a shaped locking joint so that they are both essentially one piece, together with a controlled transverse metering orifice arranged in the stem spindle; opening into said annular space between the stem cup and the stem spindle. Thus, relative movement between the stem cup and the stem spindle cannot occur relative to each other during operation of the valve, thus a precisely controllable tilting valve is achieved. A further advantage is that the stem cup projected into the stem spindle is not subject to swelling, which would result in the nylon stem and cup being detached, since the nylon cup and the nylon spindle swell in one piece.

Other features and advantages will be explained in the following description, drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of the tilting valve of the present invention positioned within a mounting cup for connection to a spray container;

Fig. 2 is a cross-sectional view of an alternative embodiment of a tilt valve according to the present invention, also provided in a mounting cup;

Fig. 3 is an enlarged cross-section of the tilting stem of the tilting valve of the present invention showing both the stem and stem in their desired relative position as a whole;

Fig. 4 is a cross-sectional view illustrating how, in accordance with the present invention, a stem spindle, stem cup and dispensing opening of Fig. 3 are formed.

DETAILED DESCRIPTION OF THE INVENTION

1 and 2 are cross-sectional views through the axis, which are in plan view of a circular structure, unless otherwise indicated. Similar parts in FIGS. 1 and 2 have the same reference numerals. The tilting valve assembly 10 is shown mounted in a conventional metal mounting cup 11. The mounting cup 11 has a circumferential channel 12 which is bent in a known manner above the top opening of the spray container (not shown). A conventional seal, such as a sleeve-like, thin-layer seal, clipped seal, or liquid seal applied, provides a seal between the channel 12 and the rim of the container opening when bent. The tilting valve assembly 10 is bent to the base 13 of the mounting cup 11 as shown. The spray container is filled with the product and propellant in a known manner, according to the present invention preferably by pressurization.

The tilting valve assembly 10 includes a housing. 14 of a valve made, for example, of nylon. The housing 14 has a lower stem portion 15 to which will be attached a conventional immersion tube (not shown) extending to the bottom of the spray container containing the product and propellant. The housing 14 also includes a housing portion 17. The base 13 of the assembly cup 11 is curved around the housing 14 as shown.

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The tilting valve of the present invention comprises a plastic stem spindle 18 and a plastic stem cup 19, the details and shapes of which will be described below with reference to Figures 3 and 4. The stem spindle 18 and stem stem 19 may be, for example, nylon, or or of acetal. The stem cup 19 has an outer peripheral edge 20 so that it normally fully engages its periphery with the bottom surface of a flexible seal 21, made, for example, of butyl rubber. The cylindrical seal 21 has a central annular aperture 22 surrounding and abutting the stem spindle 18, and an upper surface 23 that abuts the lower surface 24 of the base 13 of the mounting cup 11. The stem spindle 18 has, as shown, an upper end 18a which it extends above the gasket and mounting cup, and the lower end 18b that extends below the gasket inside the stem cup 19.

The sheath 14 has end teeth with teeth 25 that extend into the region of its upper outer periphery, between which there are spaces 26, thereby allowing pressurization of the cartridge in a known manner. The end toothing with the teeth 25 centers and holds the seal

In addition, in the region of the upper inner periphery of the housing 14, there are protrusions 27 which press the seal 21 into tight sealing contact with the underside 24 of the base of the mounting cup. The housing 14 has in its housing part 17 a plurality of inner projections 28 that support the lower end of the spring 29, where the upper end of the spring 29 pushes the stem cup 19 upwardly toward the seal 21 so that the outer peripheral edge 20 of the stem cup 19 .

Upon operation of the tilting valve, the upper end 18a of the stem spindle 18 is tilted under finger pressure, for example in the direction of the arrow

The outer peripheral edge 20 of the stem cup 19 then partially moves away from the gasket 21, in particular on the left side according to the tilting direction shown in FIG. the spray container is then pushed by the propellant upwards (not shown) through the cavity of the lower shaft portion 15 of the housing 14, then through the housing portion 17 of the housing 14, and along the outer side of the stem cup wall 19 and all of the outer peripheral edge 20 of the stem cup 19 which is moved away from the gasket 21 by tilting up to the annular space 30 between the lower end 18b of the stem spindle and the inner side of the wall of the stem cup 19. In the annular space 30 the product pressure is equalized and flowing all the way up to at least one inlet dispensing opening 31 a shank on one side of the lower end 18b spindle. The product flows through the inlet dispensing opening 31 and upwardly through the hollow passage 32 in the stem spindle 18 from which it exits at its apex. When pressure is exerted on the tilting valve, the resilient seal 21 and spring 29 cause the valve to close by restoring the entire outer peripheral edge 20 of the stem cup 19 to full contact with the seal 21, thereby also closing any further product flow into the annular space 30. .

The embodiment of FIG. 2 is more or less identical and works in the same way as the embodiment of FIG. 1. The flexible seal 21 extends into the curved annular groove 33 in the stem spindle 18 to desirably increase the sealing effect between the seal 21 and the stem spindle 18.

Turning now to FIGS. 3 and 4, FIG. 3 shows an integrated stem spindle 18 and stem cup 19 rigidly connected together as one piece with a side inlet dispensing opening 31 located within the annular space 30 between the lower end 18b of the stem of the spindle 18 and the shaft of the stem · · · · · «· · φ

Of course, there may be a plurality of these dispensing apertures 31, for example two or four, similarly disposed within the annular space 30 at the periphery of the lower end 18b of the stem spindle 18. In Fig. 3, the stem spindle 18 and stem cup 19 are shown magnified over 1 and 2, and the corresponding parts are designated identically. Figure 4 schematically illustrates the method of forming the assembly of Figure 3.

Referring to FIG. 4, the stem spindle 18 with the upper and lower ends 18a, 18b is first molded in one piece in a first conventional injection molding operation. The stem spindle 18 is simultaneously provided with an annular recess 34 that extends around the periphery of the stem spindle. During this initial forming operation, at least one transverse inlet dispensing opening 31 of a predetermined and controlled dimension extends through the side wall of the stem spindle 18 extending from the outside through the hollow discharge opening 32 of the stem spindle 18.

With respect to the operation described above, the stem spindle 18 thus formed with at least one metering orifice 31 as a whole is moved to a separate press station and is centered and positioned in the mold 37 in the position shown. The annular shield 38 is then moved downwardly to the depicted position, and the bottom radial inner annular portion 39 of the shield 38 is then in direct sealing contact with the outer wall wall of the lower end 18b of the stem spindle 18 to seal the lateral dispensing opening 31 as shown. as well as the upper end 18a of the stem spindle 18. The annular shield 38 with the bottom annular portion 39, the mold 37, and the base portion 18d of the stem spindle 18 with the annular groove 34 now define a closed annular mold cavity 36 whose shape is shown in cross section. The shape of this mold cavity 36 fully corresponds to the shape of the stem cup 19 shown in FIG. 3. A plastic material is then injected into the mold cavity 36. and forming a stem cup 19 having an inwardly directed protrusion 35 as shown in FIG. 3. The annular protrusion 35 completely fills the annular groove 34 in the stem spindle 18. The annular portion 39 of the shield 38 does not merely act to separate the dispensing opening 31 from but also causes the annular space 30 to be formed between the stem spindle 18 and the stem cup 19. When the stem cup is molded, the mold 37 and the shield 38 with the bottom portion 39 are completely pulled out of the article formed essentially as one piece. , and consisting of a stem spindle 18 and a stem cup 19.

As can be seen in FIGS. 1 to 3, the newly formed stem spindle 18 and stem cup 19 are substantially in one piece with no possibility of disengagement or possible relative displacement during operation of the valve. The stem spindle and stem cup are integrated in a simple solid construction so that even the swelling of the nylon spindle or cup does not cause them to disengage. Similarly, an exact side dimensioned inlet dispensing opening 31 is easily formed in the annular space 30 formed between the stem spindle and the stem cup. Thus, in the assembly of FIG. 1, an economical and improved tilt valve is achieved.

It will be understood by those skilled in the art that variations or modifications may be made to the solution of the present invention without departing from the spirit and scope of the invention. The present embodiments are therefore to be considered illustrative and not restrictive. It is also understood that terms such as " upper, " lower, " internal, "

corresponding similar terms relating to position as used in the descriptive part of the substrates are only in relation to the positions shown in Figures 1 to 4 and are not limiting in any way.

Claims (6)

Patent claims A method of manufacturing an integrated spray tilting valve stem having a stem spindle and a stem cup, comprising injection molding the stem spindle, comprising forming an annular groove from the outside of the stem spindle in the region of one end of the stem spindle, and forming at least one transverse metering orifice a side wall of the stem spindle and situated adjacent the annular recess; inserting the molded stem spindle into a mold defining an open cavity having partial walls spaced apart from the stem spindle; aligning the annular shield about the stem spindle such that the lower portion of the inner face of the shield encloses at least one inlet dispensing opening, and the lower portion of the outer face of the shield together with other cavity walls defines a closed mold cavity having the desired stem cup shape; injecting the molding mass into the closed cavity to form a stem cup including a shaped annular projection on the stem cup extending into the annular groove on the stem spindle; removing the shield and the mold to achieve a firmly integrated, integrated stem cup and stem spindle. The invention according to claim 1, wherein the lower portion of the annular shield after removal of the shield when the stem cup is already formed defines an annular space between the inner surface of the stem cup and the outer surface of the stem spindle, it is situated to connect this annular space and the hollow spindle discharge channel. · * · 4 · «♦ The invention of claim 2, further comprising inserting the stem stem and stem cup in a rigid connection as one piece into a valve housing provided with means for biasing the stem stem and stem stem upwardly; aligning the gasket around the stem spindle and at the top of the stem cup; and attaching the housing to the spray valve assembly cup. 4. A spray tip valve and a mounting cup comprising a housing connected to the mounting cup; a stem having a hollow stem spindle and a stem cup; a sealing insert surrounding the stem spindle and held in position against the lower surface of the mounting cup; a stem cup whose outer peripheral edge is normally biased against and fully abuts the gasket in the closed position of the valve, and the outer peripheral edge of the stem cup is partially spaced from the gasket when the valve is tilted so that product can flow therebetween; an inner wall of the stem cup and an outer wall of the stem spindle defining an annular space therebetween; at least one transverse inlet dispensing opening is situated below the outer peripheral edge of the stem cup; the stem spindle and the stem cup are formed elements, the stem spindle having an annular groove on its outer wall, in the region of its lower end, into which the inner annular projection of the stem cup is formed to form an integrated whole of the stem spindle and stem cup. The invention according to claim 4, wherein the stem spindle and the stem cup are made of nylon. • oqo-442. Patent claims Modified wording 4. A spray and tilt valve and a mounting cup, comprising a housing attached to the mounting cup; a stem having a hollow stem spindle and a stem cup; a sealing insert surrounding the stem spindle and held in position against the lower surface of the mounting cup; a stem cup whose outer peripheral edge normally fully pressurizes to the gasket in the closed position of the valve, and wherein the outer peripheral edge of the stem cup is partially spaced from the gasket when the valve is tilted to allow flow therebetween; an inner wall of the stem cup and an outer wall of the stem spindle defining an annular space therebetween; at least one transverse inlet dispensing opening is situated below the outer peripheral edge of the stem cup; the stem spindle is formed as a first molded member with a simultaneously formed inlet dispensing opening; the stem cup is formed as a second molded member, formed into and around said first member, thereby forming an integrated assembly of the stem spindle and the stem cup. The spray tip valve and assembly cup of claim 4, wherein the stem spindle first has a circular groove in its outer wall, in the region of its lower end, into which the inner annular projection of the stem cup is pressed. 0 0 # 91 · «·« 0 «91 9 ··» 9999 · ·· * 00 · * · * to form an integrated stem spindle and stem cup assembly. The spray tip valve and assembly cup of claim 2 or 5, wherein the at least one inlet dispensing opening extends transversely through the side wall of the stem spindle. A spray tip valve and a mounting cup according to any of the preceding claims 4 to 6, wherein the stem spindle and the stem cup are made of nylon.